Fig. 1: Growth and spectral characterizations of ultrathin antimony oxide crystals.

a Schematic of the strategy for the growth of ultrathin antimony oxide. b OM image of ultrathin antimony oxide crystals grown on the re-solidified Ag substrate. c Raman spectra of ultrathin antimony oxide crystals with different thicknesses. d XPS spectra of the ultrathin antimony oxide.